John Dinneen (23 March 1867 â 1 January 1942) was an Irish Farmers' Party politician. A farmer, he was first elected to Dáil ÃÂireann at the 1922 general election as a Farmers' Party Teachta Dála (TD) for the Cork East and North East constituency. He was re-elected at the 1923 general election for the Cork East constituency. He lost his seat at the June 1927 general election.
His nephew Liam Ahern served as a Fianna Fáil Senator and TD from 1957 to 1974 and his grand-nephew Michael Ahern, son of Liam Ahern, has been a Fianna Fáil TD for Cork East from 1982 to 2011.
In June 1922 the Bishop of Cloyne Robert Browne, contributed ã20 each to the election funds of Michael Hennessy and Dinneen, Commercial and Farmer pro-Treaty candidates respectively for the Cork East and North East constituency.